433 



it is immaterial .which way the cross is made. Reciprocally bred 

 first crosses are identical. 



2) The inheritance of horns is closely connected with sex. 

 Large horns are dominant in the male, recessive in the female. 



3) The meaning of scurs is not yet settled. 



4) A horned ram may be either pure horned or heterozigous. 



5) A hornless ram must be pure hornless. 



6) A horned ewe must be pure horned. 



7) A hornless ewe may be either pure hornless or heterozigous. 



8) The occasional occurrence of scurs in Suffolks is probably 

 explained by the dominance of the hornless condition in the female. 



9) There is no dominance of white face over black or vice- 

 versa. Pure white and black faces segregate in the second gene- 

 ration. 



10) Woolly and bare heads appear to be a pair of characters 

 which blend in the first cross but segregate again in later gene- 

 rations. 



n) A number of striking instances of recombination have 

 been observed. 



12) The slowness and lack of certainty in testing the females 

 and the complicated nature of what might have been hoped to be 

 simple characters, are the principal difficulties of experimental breed- 

 ing with large animals. 



The experimental work of the Agricultural Department of the 

 University of Cambridge has been transferred from Impington to 

 Gravel Hill, where it is proposed to begin a new series of sheep 

 breeding experiments on somewhat different lines, bearing more 

 directly on points of economic importance such as would be likely to 

 appeal to the butcher, the dealer or the wool merchant, but expe- 

 riments on these lines are hardly likely to turn out less complicated 

 than horns or face colour. 



P. MCCONNELL. Live stock: Breeding and Management. 



London and New York, p. 112, pi. i, figs 15. 



This contains a ^hort description of the principles and methods 

 of live stock farming, of each breed worthy of note, and of the 

 directions in which further improvement may be expected. 



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